Electrical soldering device



ilcv. 1925. 1,561,224

R. FFJTSC HE ELECTRICAL SOLDERING DEVICE Filed Oct. 8, 1924 immlllPatented Nov. 10, 1925.

- UNITED STATES RICHARD FRITSCHE, OF LIPPSTADT, GERMANY.

ELECTRICAL SOLDEBING DEVICE.

Application filed October 8, 1924. Serial No. 742,311.

To all whom it may concern:

Be it known that I, RICHARD Fm'rsoHn, a citizen of the German Empire,andresidmg at Lippstadt, Germany, have invented certain new and usefulImprovements in Electrical Soldering Devices, of which the following'isa specification,

The invention relates to a device adapted for soldering electricallywires, saw-blades and the like, and in particular for soldering thewires of wire cables. Up to the present time the wires in hoisting andother wire cables were soldered'by means of a gas flame, which provedtiresome and unreliable. Thls drawback is overcome by the new electricalsoldering device. In order to be able to quickly regulate the intensityof current according to requirements, accordmg to the present inventionthe heating of the wire, saw blade or the like to be soldered iseffected by means of an alternating current transformer, whose primarycoil is subdivided in at least two coils, which can be connected bymeans of push-buttons in such a way that either only one coil will actsolely, or that both or a plurality of primary coils are con nected inseries or parallelly.

A mode of execution of the device of the kind referred to is representedon the drawing in which 7 Figure 1 is an elevation,

Figure 2 a side elevation of the clamp, serving for holding the wire,

gigure 3 a top view of the push-button an Figure 4 a diagram showing theconnection of the primary coils.

The secondary coil to of the transformer a is connected with thesupports 12 which are insulated from one another and from the casing.Upon these supports two clamping devices a and (l are mounted andadapted to be adjusted in respect of the wire to be soldered. The clampd is resting immediately on the support I) and can be adjusted by meansof a thumb-nut while the clamp 0 slides upon a base 6 provided with astop, and it can be fixed by means of a thumb-nut g to said support. Twosprings engaging the clamp c laterally. tend to pull the clamps againstthe stop of the base e projecting in an upward direction. Each clamp ispro vided with a clamping arm h which is pressed against the stationaryclamping jaw by means of a winged nut 1; against the action of a springis which latter tends to lift nected differently by means of thepush-buttons l, 2, 3. The push-buttons 1 and 2 are mounted on a lever lconsisting of insulating material, and on both sides-of its axis ofrotation n. This lever carries upon its disengaged end besides the pushbutton 1 a contact knife 8 adapted to engage a contact 8 of the primarycoil.- On the opposite end of the lever Z both the contact knives p andg are arranged, adapted to engage the contacts p and g of the primarycoil. Generally the lever Z is held in its inoperative position by meansof a spring t, in which position none of the contact knives will be inengagement with the pertinent contact.

The push-button 2 is mounted on a onearmed lever m carrying on itsdisengaged end a contact knife 7' which will engage the contact 7' afterpressing down the said pushbutton.

As soon asthe push-button 1 is pressed down the contact 8 s will beclosed. The current supplied from the lead 0a (Figure 4) will then flowthrough the first primary coil u, from thence through the lead a to vthe closed contact sys further through the leads a and z to the secondcoil 'v and through the lead 3 to the other pole. Thus both the coils uand 'v are connected in series.

If the push-button 2 is pressed down, the current will flow from-thelead a: through a and e to the contact r r from thencethrough .2 to thecoil v and from there to the lead y. 'Thus only the coil o is cut in.

On pressing down the push-button 3 the current will flow from'the leadon through the coil to and from thence through'z e to contact 9 g andfrom there through 2 to the lead y. Another portion of the current willflow from the lead a: through 2, 2 to the contact 11 p, from herethrough a z to the coil 'v and from the latter to the lead 3 Thus boththe coils u and c are connected parallelly.

The ends of the wires'to be soldered together are made oblique and thenfixed in the clamps c and d in such a manner that the oblique ends willfit together. In this instance the clamp 0 must abut with its rear endagainst the stop of the base e. Then a piece of thin brass wire is woundround the portion to be soldered in order to serve soldering material,and then according to the diameter of the wire to be soldered one of thepush-buttons 1, 2 or 3 is pressed down for the purpose either to cut inonly one coil or to connect both coils in series or parallelly. As soonas the wire is sufficiently heated, in any case both coils will beconnected in series with the object in view to allow the solder to flowproperly and to fill in neatly the space between both ends of wire.Copper wires too, can be soldered with silver solder in the same manner,

The wire will expand under the action of the heat thus causing theoblique ends of wire to be pressed firmly together, since the clamps 0and (Z cannot recede. After the solder has reached its liquid state, thepushbutton is released, so that the supply of current is interrupted andthe wire allowed to cool down. When it is shrinking again in consequenceof the cooling the movable clamp can yield against the action of thesprings 7 thus preventing any tugging at the soldered point still Warm,through which the uniformity and solidity of the solder would beaffected.

ll claim:

1. An electric soldering device for wires, saw blades, steel bands andthe like, comprising a transformer having a multiple part primary coiland a secondary coil, a com trally pivoted lever, contacts, andelectrical connections, whereby when the said lever is moved in onedirection it bears against predetermined contacts to close a circuitthrough the primary coil with the parts thereof in series, and when thesaid pivoted lever is moved in the opposite direction it bears againstcontacts to close a circuit through the primary coil with the partsthereof in parallel.

2, An electric soldering device for wires,

saw blades, steel bands and the like, com

prising a transformer having a two part primary coil and a secondarycoil, a cen-,

the primary coil with the parts thereof in parallel.

3. An electric soldering device for wires, saw blades, steel bands andthe like, comprising a transformer having a two part primary coil and asecondary coil, a centrally pivoted lever, contacts, and electricalconnections, whereby when the said lever is moved in one direction itbears against predetermined contacts to closea circuit through theprimary coil with the parts thereof in series, and when the said pivotedlever is moved in the opposite direction it bears against'contacts toclose a circuit through the primary coil with the parts thereof inparallel, and a second lever pivoted adjacent one end thereof andadapted to bear against contacts to close an electric circuit throughone part only of the said primary coil.

lln testimony whereof I aflix my signature to this specification.

RICHARD FRITSCHE,

